<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
<script>
    // 深拷贝拷贝多层, 每一级别的数据都会拷贝.
    var obj = {
        id: 1,
        name: 'andy',
        msg: {
            age: 18
        },
        color: ['pink', 'red']
    };
    var o = {};

    // 封装函数
    function deepCopy(newobj, oldobj) {
        for (var k in oldobj) {
            // 判断我们的属性值属于那种数据类型
            // 1. 获取属性值  oldobj[k]
            var item = oldobj[k];
            // 2. 判断这个值是否是数组
            if (item instanceof Array) {
                newobj[k] = [];
                deepCopy(newobj[k], item)
            } else if (item instanceof Object) {
                // 3. 判断这个值是否是对象
                newobj[k] = {};
                deepCopy(newobj[k], item)
            } else {
                // 4. 属于简单数据类型
                newobj[k] = item;
            }

        }
    }

    deepCopy(o, obj);
    console.log(o);

    var arr = [];
    console.log(arr instanceof Object);
    o.msg.age = 20;
    console.log(obj);
</script>
</body>

</html>
